MOOC 無(wú)線(xiàn)通信原理（雙語(yǔ)）-南京郵電大學(xué) 中國(guó)大學(xué)慕課答案

MOOC無(wú)線(xiàn)通信原理（雙語(yǔ)）-南京郵電大學(xué)中國(guó)大學(xué)慕課答案IntroductiontoWirelessCommunicationsIntroductiontoWirelessCommunications1、問(wèn)題：Ifacarrierfrequencyf=60GHzisadoptedforawirelesscommunication,thewavelengthλofthecarrierwaveis___.選項(xiàng)：A、5mmB、10mmC、20mmD、50mm正確答案:【5mm】2、問(wèn)題：TheBluetoothsystemsbelongtothewirelessnetworkof___.選項(xiàng)：A、WMANB、WLANC、WPAND、WWAN正確答案:【W(wǎng)PAN】3、問(wèn)題：In2000,ITUapprovedthreestandardsofWCDMA,CDMA2000and___.選項(xiàng)：A、TD-CDMAB、IS-95C、GSMD、TD-SCDMA正確答案:【TD-SCDMA】4、問(wèn)題：Forawirelesscommunicationsystem,iftheinputpoweris8dBm,andtheoutputpoweris5dBm,thesystemattenuationis___.選項(xiàng)：A、3dBmB、3dBC、13dBmD、13dB正確答案:【3dB】5、問(wèn)題：Mostcellphonesoperateinthefrequencyrangeof800to2,200KHz.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】6、問(wèn)題：WIFIisawirelesslocalnetworkthatrunsoftheIEEE802.15standardsset.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】7、問(wèn)題：Frequencydivisionduplexingsystemusesdifferenttimeslotsfortheforwardandreversechannels.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】8、問(wèn)題：TheShannoncapacitydeterminesthetheoreticallimitonchannelcapacityforagivenbandwidthandsignal-to-noiseratio.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】TheCellularConcept:SystemDesignFundamentalsTheCellularConcept:SystemDesignFundamentals1、問(wèn)題：Inthecellularnetworks,thecoverageareaofeachbasestationisnamedascell.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】2、問(wèn)題：IntheN-Cellreusepattern,thefrequencyreusefactoris1/N.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】3、問(wèn)題：Inadynamicchannelassignmentstrategy,eachcellisallocatedapredeterminedsetofchannels.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】4、問(wèn)題：Foraproperhandoffsituation,thehandoverthresholdshouldbesetslightlyweakerthanMinimumusablesignallevel選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】5、問(wèn)題：InanN-cellreusepattern,Ncanchooseanypositivenumber.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】6、問(wèn)題：Asmallvalueoftheco-channelreuseratioprovideslargercapacity.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】7、問(wèn)題：Cellularradiosystemsrelyontrunkingtoaccommodatealargenumberofusersinalimitedradiospectrum.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】8、問(wèn)題：Aradiochannelthatisoccupiedfor20minutesduringanhourcarriers20Erlangsoftraffic.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】9、問(wèn)題：Cellsplittingisusedinhighdensitysubscriberareastodecreasesystemcapacity.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】10、問(wèn)題：Sectoringhasthecapabilityofdecreasingtheco-channelinterferenceandthusincreasingsystemperformance.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】MobileRadioPropagation:Large-ScalePathLossMobileRadioPropagation:Large-ScalePathLoss1、問(wèn)題：Theeffectiveradiatedpowerdenotesthemaximumradiatedpowerascomparedtothe___.選項(xiàng)：A、isotropicantennaB、monopoleantennaC、half-wavedipoleantennaD、parabolicantenna正確答案:【half-wavedipoleantenna】2、問(wèn)題：Thegrowthrateofthepathlossinfreespaceis___.選項(xiàng)：A、1dB/decadeB、10dB/decadeC、20dB/decadeD、100dB/decade正確答案:【20dB/decade】3、問(wèn)題：___occurswhenapropagatingwaveimpingesuponanobjectwhichhasverylargedimensionswhencomparedtothewavelengthofthewave.選項(xiàng)：A、ReflectionB、DiffractionC、ScatteringD、Reflectionordiffraction正確答案:【Reflection】4、問(wèn)題：TheQ-functionisdeterminedbythefactorsexceptthe___ofthereceivedsignal.選項(xiàng)：A、thresholdlevelB、averagepowerC、coverageareaD、standarddeviation正確答案:【coveragearea】5、問(wèn)題：Infreespace,thereceivedpowerisproportionaltothecarrierwavelength.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】6、問(wèn)題：Thepathlossrepresentssignalgainasapositivedifferencebetweentheeffectivetransmittedpowerandthereceivedpower.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】7、問(wèn)題：Whenthemediumconsistsofalargenumberofobjectswithdimensionsthataresmallcomparedtothewavelength,scatteringwavecanbeobserved.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】8、問(wèn)題：Theclose-inreferencedistance,thepathlossexponentandthestandarddeviationstatisticallydescribethepathlossmodelconsideringrandomshadowingeffects.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】Small-ScaleFadingandMultipath,andIntroductionofMIMOTechnologiesSmall-ScaleFadingandMultipath,andIntroductionofMIMOTechnologies1、問(wèn)題：Fadingcanbeclassifiedintosmallscalefadingandlargescalefading.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】2、問(wèn)題：Small-scalefadesarecharacterizedbydeepandslowamplitudefluctuationswhichoccurasthemobilemovesoverdistancesofjustafewwavelengths.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】3、問(wèn)題：Whatisfrequencyflatfading?Atypeofsmallscalefadingwherefrequencysignalcomponentsexperiencedifferentmagnitudesoffading.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】4、問(wèn)題：Iftheattenuationandpathdelayofacomplexchannelresponsevarywithfrequency,thechanneliscalledatime-variantcomplexchannel.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】5、問(wèn)題：Forsimulatingafrequencyselectivechannel,discrete-timeTDLfiltersismandatorytohaveN=1whileNisthenumbertapsofthefilter.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】6、問(wèn)題：TherearemanydiversitymethodstorealizeIndependentfadingpaths,suchasSpaceDiversity,PolarizationDiversity,Frequencydiversityandtimediversity.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】7、問(wèn)題：SmallScaleFadingisdividedintotwomain,i.e.,multipathdelayspreadandfrequencyspread.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】8、問(wèn)題：MIMOstandsfor‘MultipleInput,MultipleOutput’,andisaformofradioantennathatincreasesefficiencybyincreasingthenumberoftransmittersandreceivers.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】9、問(wèn)題：MIMOcapacityisindependentonpropagationchannel.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】10、問(wèn)題：ForabadMIMOchannels,spatialcorrelationishighandthecapacityislow.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】MultipleAccessTechniquesforWirelessCommunicationsMultipleAccessTechniquesforWirelessCommunications1、問(wèn)題：CDMAusesthepowercontroltocombatthe.選項(xiàng)：A、self-jammingB、near-farproblemC、multi-userinterferenceD、noiseinterference正確答案:【near-farproblem】2、問(wèn)題：Whichsystemneedstheequalization?選項(xiàng)：A、OFDMAB、FDMAC、CDMAD、TDMA正確答案:【TDMA】3、問(wèn)題：WhichisthefeatureofslottedAloha?選項(xiàng)：A、Timeisdividedintoequaltimeslots.B、Transmitonlyatthebeginningofatimeslot.C、Avoidpartialcollisions.D、Increasedelay,andrequiresynchronization.正確答案:【Timeisdividedintoequaltimeslots.#Transmitonlyatthebeginningofatimeslot.#Avoidpartialcollisions.#Increasedelay,andrequiresynchronization.】4、問(wèn)題：WhicharefeaturesoftheCDMAsystem?選項(xiàng)：A、SofthandoffB、near-farproblemC、self-jammingandsoftcapacitylimitD、RAKEreceiver正確答案:【Softhandoff#near-farproblem#self-jammingandsoftcapacitylimit#RAKEreceiver】5、問(wèn)題：_____and____canimprovethecapacityofCDMAsystem.選項(xiàng)：A、AntennaSectorizationB、CellsplittingC、VoiceactivityD、Coveragezoom正確答案:【AntennaSectorization#Voiceactivity】6、問(wèn)題：ThereareTDMA/TDDandTDMA/FDD.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】7、問(wèn)題：CDMAissuperiortoTDMAandFDMA.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】8、問(wèn)題：Spreadspectrumlowersthesignalleverandreducesthebandwidthofchannel.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【錯(cuò)誤】9、問(wèn)題：ThevulnerableperiodinpureAlohaistwopackets,andthevulnerableperiodinslottedAlohaisapacket.選項(xiàng)：A、正確B、錯(cuò)誤正確答案:【正確】10、問(wèn)題：ThecapacityofFDMAandTDMAsystemisinterferencelimit